Yeah it's possible that by now many anthems don't truly mean what they currently or originally said, or reference things that are kinda irrelevant today. They're just rousing words that fit a tune, and people sorta go along with it. And tbh as I said the UK anthem doesn't currently openly call for my slaughter and I don't live in fear that I'll be persecuted by the UK government on account of my national identity. But I think it's one thing to have a "Remember this external foe we defeated in our independence struggle" section in your anthem and another to have had one saying "A very large part of our nation must be defeated and its people subjugated", particularly if you are one of those people